Quote:
Originally Posted by Howie Glatter
"That is not a good holographic diagram, you can clearky see that tye light rings on the left are thicker than the right."
That is not due to miscollimation. Because the red laser diode beam has polarization, the width of the diffracted circle lines varies from narrow to wider with a 90 degree rotation.
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Sorry, my poor symantics, i should have been clearer and mentioned my concern as being the spacing between the light rings, which can be clearly seen to be different left to right - not the thickness of the light ring itself. I would agree that the light ring characteristics can vary as you rotate the laser but your actually looking for the spacing to be equalised and centred during rotation.